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学者姓名：陈永毅
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Abstract ：
Quantum dot (QD) based light-emitting diode devices (QLEDs) attracted significant academic interest due to their outstanding color saturation and convenient solution-based manufacturing processes. Currently, the external quantum efficiency (EQE) of red, green, and blue QLEDs reached their own theoretical limits. However, there was still a common phenomenon of roll-off existed in QLEDs. In this work, QLEDs with an ultra low roll-off were realized via simple carrier injection regulation strategy in achieving carrier recombination balance and exhibited excellent repeatability. By modifying quantum dots and electron transport layer (ETL), the champion device with the peak EQE of 15.2 %, and a current efficiency (CE) of 63.4 cd/A was successfully fabricated, which were 1.9 and 2.0 times greater than those of the control devices, respectively. The devices delivered a peak brightness of 266,778 cd/m2, and the EQE remained at 15.0 % at a brightness of 50,000 cd/m2, staying above 14 % within the range of 3000 to 200,000 cd/m2. At a voltage of 10 V, the peak EQE of the optimized devices decreased by only 7.6 % when compared with their optimum value of EQEs, while the EQE of the control device declined by 26.6 %. Finally, analysis of 40 different batches of devices revealed an average EQE of 14.3 %, demonstrating that this strategy exhibited good repeatability. This approach provided a convenient means to regulate carrier injection and further elucidated the relationship between roll-off and carrier injection balance in QLEDs, proposing a strategy to enhance their performance and simultaneously mitigate roll-off.
Keyword ：
Low roll-off Low roll-off QLEDs QLEDs Quantum dots (QDs) Quantum dots (QDs) Repeatability Repeatability
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| GB/T 7714 | Chen, Ye , Yang, Zunxian , Wang, Jiaxiang et al. Dual optimization strategies to achieve low roll-off and stable quantum dot light-emitting diodes [J]. | OPTICAL MATERIALS , 2025 , 160 . |
| MLA | Chen, Ye et al. "Dual optimization strategies to achieve low roll-off and stable quantum dot light-emitting diodes" . | OPTICAL MATERIALS 160 (2025) . |
| APA | Chen, Ye , Yang, Zunxian , Wang, Jiaxiang , Zhang, Hui , Chen, Yue , Jiang, Xudong et al. Dual optimization strategies to achieve low roll-off and stable quantum dot light-emitting diodes . | OPTICAL MATERIALS , 2025 , 160 . |
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Perovskite quantum dots (PQDs) have emerged as promising candidates for next-generation high-quality lighting and high-definition displays due to their outstanding luminescence properties, characterized by a narrow emission spectrum and tunable color. However, during the purification process involving polar solvents, ligand detachment from the quantum dot surface often induces crystal defects, thereby compromising their long-term stability. Herein, the effects of various post-processing strategies on PQD performance are systematically explored, including the use of oleic acid (OA), didodecyldimethylammonium bromide (DDAB), and their combinations, alongside OA-assisted synthesis. Furthermore, a synergistic post-processing strategy based on DDAB-NaMeS (sodium methanesulfonate) is proposed to elucidate the mechanism of ligand reconstruction on the quantum dot surface during purification. The resulting PQDs demonstrated excellent stability over a storage period exceeding one month, and the corresponding Quantum Dots Light-Emitting Diodes (QLEDs) achieved a peak external quantum efficiency (EQE) of 9.82%, representing a 1.91-fold improvement over standard devices. These QLEDs exhibited exceptional optoelectronic performance, underscoring their potential for application in other sulfonic acid ligands and perovskite-based materials.
Keyword ：
ligand exchange ligand exchange light-emitting diodes light-emitting diodes perovskite quantum dots perovskite quantum dots post-treatment post-treatment surface reconstruction surface reconstruction
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| GB/T 7714 | Wang, Jiaxiang , Yang, Zunxian , Chen, Ye et al. Sulfonic Acid Ligands Promote Surface Reconstruction of Perovskite Quantum Dots for High-Performance Light-Emitting Diodes [J]. | ADVANCED OPTICAL MATERIALS , 2025 , 13 (8) . |
| MLA | Wang, Jiaxiang et al. "Sulfonic Acid Ligands Promote Surface Reconstruction of Perovskite Quantum Dots for High-Performance Light-Emitting Diodes" . | ADVANCED OPTICAL MATERIALS 13 . 8 (2025) . |
| APA | Wang, Jiaxiang , Yang, Zunxian , Chen, Ye , Zhang, Hui , Chen, Yue , Bai, Yuting et al. Sulfonic Acid Ligands Promote Surface Reconstruction of Perovskite Quantum Dots for High-Performance Light-Emitting Diodes . | ADVANCED OPTICAL MATERIALS , 2025 , 13 (8) . |
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Abstract ：
Perovskite quantum dots (PQDs) have attracted more and more attention in light-emitting diode (LED) devices due to their outstanding photoelectric properties. Surface ligands not only enable size control of quantum dots but also enhance their optoelectronic performance. However, the efficiency of exciton recombination in PQDs is often hindered by the desorption dynamics of surface ligands, leading to suboptimal electrical performance. In this study, sodium methanesulfonate (NaMeS) was successfully introduced during PQD synthesis and ligand exchange, where the S=O groups effectively interacted with the perovskite components. The NaMeS-modified PQD films exhibited significantly improved surface morphology, radiative recombination efficiency, and carrier mobility. Consequently, Pe-LEDs derived from NaMeS-capped PQDs achieved a remarkable enhancement in performance with a maximum external quantum efficiency of 9.41%. This work thus provides a novel and effective strategy for the development of high-performance PQDs and their applications in LEDs.
Keyword ：
ligand exchange ligand exchange perovskite quantumdots perovskite quantumdots radiativerecombination radiativerecombination sodium methanesulfonate sodium methanesulfonate surface passivation surface passivation
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| GB/T 7714 | Ye, Yuliang , Wang, Jiaxiang , Yang, Zunxian et al. Uncovering the Performance Enhancing Mechanism of Methanesulfonate Ligands in Perovskite Quantum Dots for Light-Emitting Devices [J]. | ACS APPLIED MATERIALS & INTERFACES , 2025 , 17 (4) : 6639-6647 . |
| MLA | Ye, Yuliang et al. "Uncovering the Performance Enhancing Mechanism of Methanesulfonate Ligands in Perovskite Quantum Dots for Light-Emitting Devices" . | ACS APPLIED MATERIALS & INTERFACES 17 . 4 (2025) : 6639-6647 . |
| APA | Ye, Yuliang , Wang, Jiaxiang , Yang, Zunxian , Chen, Ye , Zhang, Hui , Bai, Yuting et al. Uncovering the Performance Enhancing Mechanism of Methanesulfonate Ligands in Perovskite Quantum Dots for Light-Emitting Devices . | ACS APPLIED MATERIALS & INTERFACES , 2025 , 17 (4) , 6639-6647 . |
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Molybdenum disulfide is considered an excellent anode material for lithium-ion batteries due to its unique structure and high specific capacity. However, molybdenum disulfide's inherent low ionic transport rate and low intrinsic conductivity have limited its application in lithium-ion batteries. Compounding with carbon materials is an effective way to overcome these limitations in the application of molybdenum disulfide. In this work, the effect of carbon layer on the growth of molybdenum disulfide was systematically investigated in order to disclose the role and influence of carbon in composites with molybdenum disulfide. Furthermore, our work provides an effective method for the structural optimization of one-dimensional composites based on carbon and molybdenum disulfide just by controlling the ratio of carbon precursor to molybdenum source during its formation. After structural optimization, effective MoS2@C composite materials were successfully synthesized, which exhibited greatly enhanced electrical conductivity and structural stability and maintained a specific capacity of 800.4 mA h g(-1) even after 1200 cycles at a current density of 1 A g(-1) possibly due to the excellent specific capacity of molybdenum disulfide.
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| GB/T 7714 | Cheng, Zhiming , Yang, Zunxian , Ye, Yuliang et al. Structural optimization of novel one-dimensional composites based on in situ - grown 1D CNTs with an amorphous structure and 2D MoS2 nanosheets for improved Li storage [J]. | CRYSTENGCOMM , 2024 , 26 (25) : 3370-3382 . |
| MLA | Cheng, Zhiming et al. "Structural optimization of novel one-dimensional composites based on in situ - grown 1D CNTs with an amorphous structure and 2D MoS2 nanosheets for improved Li storage" . | CRYSTENGCOMM 26 . 25 (2024) : 3370-3382 . |
| APA | Cheng, Zhiming , Yang, Zunxian , Ye, Yuliang , Ye, Songwei , Hong, Hongyi , Zeng, Zhiwei et al. Structural optimization of novel one-dimensional composites based on in situ - grown 1D CNTs with an amorphous structure and 2D MoS2 nanosheets for improved Li storage . | CRYSTENGCOMM , 2024 , 26 (25) , 3370-3382 . |
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Quantum-dot light-emitting diodes (QLED) have become a research trend in the field of new displays due to their low cost, wide color gamut, narrow bandwidth, and characteristics that enable production through the solutiongel method. However, the electrical performance of QLED is consistently constrained by energy losses and imbalanced charge carrier injection. This motivates our focus on exciton recombination and energy losses within the quantum-dot layer to enhance the electrical efficiency of QLED. In this work, we introduce a method using a CdZnS quantum dot (B-QD) interlayer to modulate energy transfer and charge carrier transport in QLED devices employing CdSe quantum dot (G-QD) as the emissive layer. By strategically incorporating a B-QD layer between the G-QD and HTL/ETL, we facilitate energy transfer due to the overlap between the excitation wavelength of BQD and the absorption wavelength of G-QDs. This leads to enhanced energy injection in QLED devices, resulting in a high current efficiency of 39.54 Cd/A and a peak brightness of 522,272 cd/m 2 for efficient QLED. The corresponding external quantum efficiency (EQE) is greatly improved from 5.62 % to 9.4 %. Our work provides a straightforward and effective approach to modulate exciton recombination and energy injection and further can be applicable to other photo-electronics devices.
Keyword ：
dot interlayer dot interlayer Energy transfer Energy transfer Modulating exciton recombination quantum Modulating exciton recombination quantum QLED QLED
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| GB/T 7714 | Meng, Zongyi , Yang, Zunxian , Ye, Yuliang et al. Highly enhanced Quantum dot light-emitting diode performance by controlling energy resonance in inorganic insertion layers [J]. | OPTICAL MATERIALS , 2024 , 152 . |
| MLA | Meng, Zongyi et al. "Highly enhanced Quantum dot light-emitting diode performance by controlling energy resonance in inorganic insertion layers" . | OPTICAL MATERIALS 152 (2024) . |
| APA | Meng, Zongyi , Yang, Zunxian , Ye, Yuliang , Zeng, Zhiwei , Hong, Hongyi , Ye, Songwei et al. Highly enhanced Quantum dot light-emitting diode performance by controlling energy resonance in inorganic insertion layers . | OPTICAL MATERIALS , 2024 , 152 . |
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Cadmium selenide (CdSe)-based colloidal quantum dots (QDs) exhibit unique properties such as tunable colors, narrow emission, high photoluminescence efficiency, and high stability, making them one of the most promising candidates for next-generation displays. CdSe-based QD light-emitting diodes (QLEDs) have attracted more and more attention mainly due to their advantages including high electroluminescence brightness, low turn-on voltage, and ultrathin device structures. However, there are still many challenges, mainly including the lattice defects aroused by lattice strain during the QD growth process and the surface defects caused by ligand desorption. CdSe-based QLEDs with high photoelectronic performance were finally achieved in our work just by optimizing the synthesis processes and further reducing defects in QD shells. There was a great decrease in the defect density of the QD shell indirectly according to their testing results in the fluorescence lifetime and single-carrier devices. After the reaction system was diluted with a solvent in the hot-injection method, there was some blue shift in the QD emission observed from 595 to 562 nm. Then, with the ZnSe shell further coated onto the QD, the size of the effective emission center was reduced to some extent, and further, a blue shift in the emission was obtained with the wavelength down to 533 nm. Finally, on the outside of the as-synthesized QDs, the ZnS shell was used to passivate and further protect the ZnSe layer, which greatly increased the average fluorescence lifetime of the CdSe-based QDs from 22.94 to 36.41 ns. Additionally, a layer of lithium fluoride (LiF) with optimized thickness was further deposited onto the QD emitting layer to prevent ligand desorption from ethanol solvent cleaning. Therefore, the CdSe-based QD fluorescence efficiency was greatly improved and the maximum external quantum efficiency (EQE) of 8.06% for our CdSe-based QLEDs was achieved with a LiF layer of 3 nm.
Keyword ：
CdZnSe quantum dots (QDs) CdZnSe quantum dots (QDs) defect state control defect state control LiF film LiF film nucleation control nucleation control QLED QLED
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| GB/T 7714 | Huang, Qiaocan , Yang, Zunxian , Ye, Yuliang et al. Physically Controlled Nucleation for Tunable Quantum Dots and Interface Defect Modification in Light-Emitting Diodes [J]. | ACS APPLIED NANO MATERIALS , 2024 , 7 (2) : 1896-1906 . |
| MLA | Huang, Qiaocan et al. "Physically Controlled Nucleation for Tunable Quantum Dots and Interface Defect Modification in Light-Emitting Diodes" . | ACS APPLIED NANO MATERIALS 7 . 2 (2024) : 1896-1906 . |
| APA | Huang, Qiaocan , Yang, Zunxian , Ye, Yuliang , Meng, Zongyi , Zeng, Zhiwei , Hong, Hongyi et al. Physically Controlled Nucleation for Tunable Quantum Dots and Interface Defect Modification in Light-Emitting Diodes . | ACS APPLIED NANO MATERIALS , 2024 , 7 (2) , 1896-1906 . |
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Synaptic devices of optoelectronic nature, which combine light-detection and data-storage capabilities, hold significant promise in the realm of neuromorphic computing. They are especially beneficial for the processing of visual data and the execution of intricate cognitive functions akin to learning, memory retention, and logical reasoning. However, current research is mostly confined to the level of individual devices, with corresponding studies on synaptic arrays being relatively scarce. Type II heterojunctions are widely used in optoelectronics. Bandgap engineering enables efficient separation and trapping of photogenerated excitons in selected materials, reducing carrier recombination. This prolongs carrier retention in the channel, delaying photocurrent decay, crucial for artificial optoelectronic synapses. We designed an organic nanowire/perovskite Type II heterojunction where CsPbBr3 perovskite films and TIPS nanowires serve as the photosensitive and channel layers, respectively. The composite synaptic array was successfully fabricated by in-situ growth of TIPS nanowires on the surface of perovskite thin films. It was further used to fabricate a photonic synapse array that exhibits characteristic photocurrent and stable optical response. Achieving high-performance photonic synapses was facilitated by characteristics such as high mobility and high on/off ratios, stemming from the formation of complete singlecrystal nanowires on the perovskite films. Exhibiting synaptic behaviors such as photo-induced enhancements and paired-pulse facilitation, the device enabled a visual sensing system with a 5 x 5 pixel array for simulating memory processes and restoring associative memories. A novel photocurrent model was established for understanding device characteristics. This work provides valuable insights for future utilization of composite organic nanowire arrays in simulating brain-like computations and realizing large-scale intelligent visual sensing systems.
Keyword ：
High performance High performance Low power consumption Low power consumption Patterned organic single crystals array film Patterned organic single crystals array film Perovskite films Perovskite films Small molecule semiconductor Small molecule semiconductor Synapse arrays Synapse arrays
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| GB/T 7714 | Hong, Hongyi , Yang, Zunxian , Ye, Yuliang et al. Highly uniform organic nanowire synaptic arrays with excellent performance for associative memory [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 492 . |
| MLA | Hong, Hongyi et al. "Highly uniform organic nanowire synaptic arrays with excellent performance for associative memory" . | CHEMICAL ENGINEERING JOURNAL 492 (2024) . |
| APA | Hong, Hongyi , Yang, Zunxian , Ye, Yuliang , Ye, Songwei , Cheng, Zhiming , Zeng, Zhiwei et al. Highly uniform organic nanowire synaptic arrays with excellent performance for associative memory . | CHEMICAL ENGINEERING JOURNAL , 2024 , 492 . |
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Perovskite nanocrystals have absorbed increasing interest, especially in the field of optoelectronics, owing to their unique characteristics, including their tunable luminescence range, robust solution processability, facile synthesis, and so on. However, in practice, due to the inherent instability of the traditional long-chain insulating ligands surrounding perovskite quantum dots (PeQDs), the performance of the as-fabricated QLED is relatively disappointing. Herein, the zwitterion 3-(decyldimethylammonio)propanesulfonate (DLPS) with the capability of double passivating perovskite quantum dots could effectively replace the original long-chain ligand simply through a multistep post-treatment strategy to finally inhibit the formation of defects. It was indicated from theexperimental results that the DLPS, as one type of ligand with the bimolecular ion, was very adavntageous in replacing long-chain ligands and further suppressing the formation of defects. Finally, the perovskite quantum dots with greatly enhanced PLQY as high as 98% were effectively achieved. Additionally, the colloidal stability of the corresponding PeQDs has been significantly enhanced, and a transparent colloidal solution was obtained after 45 days under ambient conditions. Finally, the as-fabricated QLEDs based on the ligand-exchanged PeQDs exhibited a maximum brightness of 9464 cd/m(2) and an EQE of 12.17%.
Keyword ：
defect passivation defect passivation ligand exchange ligand exchange light-emittingdiodes light-emittingdiodes perovskite quantumdots perovskite quantumdots sulfonic acid zwitterions sulfonic acid zwitterions
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| GB/T 7714 | Zeng, Zhiwei , Meng, Yuhan , Yang, Zunxian et al. Efficient CsPbBr3 Perovskite Light-Emitting Diodes via Novel Multi-Step Ligand Exchange Strategy Based on Zwitterionic Molecules [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (8) : 10389-10397 . |
| MLA | Zeng, Zhiwei et al. "Efficient CsPbBr3 Perovskite Light-Emitting Diodes via Novel Multi-Step Ligand Exchange Strategy Based on Zwitterionic Molecules" . | ACS APPLIED MATERIALS & INTERFACES 16 . 8 (2024) : 10389-10397 . |
| APA | Zeng, Zhiwei , Meng, Yuhan , Yang, Zunxian , Ye, Yuliang , Lin, Qiuxiang , Meng, Zongyi et al. Efficient CsPbBr3 Perovskite Light-Emitting Diodes via Novel Multi-Step Ligand Exchange Strategy Based on Zwitterionic Molecules . | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (8) , 10389-10397 . |
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A carbon layer usually covers the outside of SnS/MoS2 nanosheets produced by a traditional C-layer cladding process, resulting in a material with a lower specific surface area and fewer active sites. Therefore, it is difficult for these as-obtained SnS and MoS2 materials to be directly employed as electrode materials. There is a great need to develop a new C-layer coating process that can effectively coat active materials and simultaneously increase the specific surface area. In this study, novel SnS@C/MoS2 nanotubes were designed and synthesized by a self-sacrificing template method (SSTM). Specifically, MoO3 nanoribbons were first coated with Sn to produce Sn-MOF, and SnS@C/MoS2 nanotubes with a particular nanosheet architecture preserved were achieved via an elegant SSTM vulcanization strategy. This SSTM preparation method not only retains the nanosheet microstructure of the surface but also leaves a thin layer of amorphous carbon on the surface, which greatly improves the conductivity and effectively improves the cycling stability. In addition to above-mentioned advantages, there is a synergistic effect between the various components of the SnS@C/MoS2 nanotubes, which has a positive effect on the electrochemical performance. When used as the anode of a lithium-ion battery (LIB), the SnS@C/MoS2 composite can maintain a specific discharge capacity of 970.9 mAh g(-1) after 500 cycles at a current density of 1 A g(-1), and a specific discharge capacity of 778.1 mAh g(-1) even after 1000 cycles at a current density of 2 A g(-1). This method provides a reference for the synthesis of other nanostructured materials.
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| GB/T 7714 | Ye, Songwei , Yang, Zunxian , Ye, Yuliang et al. Forming SnS@C/MoS2 nanotubes with high specific surface area via self-sacrificing template method as superior performance anode for lithium-ion batteries [J]. | CRYSTENGCOMM , 2024 , 26 (12) : 1779-1788 . |
| MLA | Ye, Songwei et al. "Forming SnS@C/MoS2 nanotubes with high specific surface area via self-sacrificing template method as superior performance anode for lithium-ion batteries" . | CRYSTENGCOMM 26 . 12 (2024) : 1779-1788 . |
| APA | Ye, Songwei , Yang, Zunxian , Ye, Yuliang , Cheng, Zhiming , Hong, Hongyi , Zeng, Zhiwei et al. Forming SnS@C/MoS2 nanotubes with high specific surface area via self-sacrificing template method as superior performance anode for lithium-ion batteries . | CRYSTENGCOMM , 2024 , 26 (12) , 1779-1788 . |
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Domain distribution, defect density as well as carrier transport all exert some great impact on the performance of quasi-two-dimensional (quasi -2D) perovskites light emitting diodes (PeLEDs). Herein, the novelty multifunctional metformin hydrochloride (MFCl) buried passivated layer was introduced to optimize the crystal dynamics, surface morphology, and electro-luminescent properties of the quasi -2D perovskites. On the one hand, MF ion to some extent optimized the domain distribution just by both decreasing the n = 2 phase and increasing the threedimensional (3D) phase, which facilitated the charge funnelling. On the other hand, by combining MFCl with PSS or PSS-Na, the energy level of the hole transport layer was effectively adjusted, resulting in an obvious reduction of the injection barrier. As a result, the MFCl-optimized blue quasi -2D PeLEDs with the maximum external quantum efficiency of 5.22 % was achieved, which is 3.6 times higher than that of the device without the MFCl treatment. This work provided favourable strategy for the performance enhancement of blue quasi -2D PeLEDs, in which a multifunction interface was introduced to synchronously improve the phase distribution as well as the defect passivation of quasi -2D perovskite, meanwhile all of those further promoted the charge transportation.
Keyword ：
Blue emitting device Blue emitting device Multifunctional Interface Multifunctional Interface Oriented Crystallization Oriented Crystallization Quasi-2D Perovskite Quasi-2D Perovskite
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| GB/T 7714 | Ye, Yuliang , Cui, Zhou , Yang, Zunxian et al. A multifunctional interface optimization strategy for efficient Quasi-2D blue perovskite Light-Emitting diodes [J]. | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
| MLA | Ye, Yuliang et al. "A multifunctional interface optimization strategy for efficient Quasi-2D blue perovskite Light-Emitting diodes" . | CHEMICAL ENGINEERING JOURNAL 483 (2024) . |
| APA | Ye, Yuliang , Cui, Zhou , Yang, Zunxian , Zeng, Zhiwei , Meng, Zongyi , Hong, Hongyi et al. A multifunctional interface optimization strategy for efficient Quasi-2D blue perovskite Light-Emitting diodes . | CHEMICAL ENGINEERING JOURNAL , 2024 , 483 . |
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